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Loans - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | $ 1,235,000 | $ 3,798,000 | $ 2,854,000
Loans and Leases Receivable, Deferred Income | 12,200,000 | 11,100,000 |
Deposit Liabilities Reclassified as Loans Receivable | 1,900,000 | 2,900,000 |
Troubled Debt Restructuring, Classification removed | 500,000 | 2,700,000 |
Partial charge-offs on impaired loans | 10,040,000 | 24,943,000 |
Allowance for loans individually evaluated for impairment | 684,000 | 548,000 |
Recorded investment, related to loans | 3,500,000 | 2,100,000 |
Loans 90 days past due and still accruing | 1,845,000 | 2,138,000 |
financing receivable non accrual current | 56,100,000 | 65,900,000 |
TDRs included in nonaccrual loan totals | 38,500,000 | 46,900,000 |
Nonaccrual TDRs considered current | 32,400,000 | 38,000,000 |
TDRs included in accruing loan totals | 20,200,000 | 18,200,000 |
Loans and Leases Receivable, Impaired, Commitment to Lend | 1,300,000 | 700,000 |
Specific reserves related to troubled debt restructuring | 500,000 | 200,000 |
Additional specific reserves related to troubled debt restructuring | 300,000 | 1,000,000 | 1,300,000
Modified substandard commercial loans, total recorded investment | 106,000 | 26,000 |
Modified substandard consumer loans total recorded investment | 8,900,000 | 7,400,000 |
Nonaccrual loans not classified as TDRs at prior fiscal year end | 1,800,000 | 9,400,000 | 800,000
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Allowance for loans individually evaluated for impairment | 0 | 0 |
Loans 90 days past due and still accruing | 1,256,000 | 1,139,000 |
Executive officers and directors |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans due from related party | 42,100,000 | 43,400,000 |
New loan made to related party | 1,600,000 | 5,400,000 |
Repayment of loans due from related party | 11,400,000 | 15,300,000 |
Increase (Decrease) in Customer Advances | 11,400,000 | 3,500,000 |
Accruing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 180,000 | 111,000 | 44,000
Nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Recorded Investment | 1,100,000 | 3,700,000 | $ 2,800,000
Financing Receivable With No Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans | 7,900,000 | 24,700,000 |
Financing Receivable With Related Allowance Recorded [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Partial charge-offs on impaired loans | 2,100,000 | 200,000 |
Loans receivable | Executive officers and directors |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans due from related party | $ 31,100,000 | $ 29,600,000 |

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